I have a ROPER upright FREEZER model # RV1299REW00. It has three shelves. The top shelf constantly experiences severe ice buildup to the point where you can't put anything on it. I have to constantly defrost it once the ice buildup gets 4-8 inches deep. The lower 2 shelves remain fine. I know the drain tube and passageway on the bottom is clear from when I defrost it. The seal looks fine all the way around. The manual referenced refrigerated shelves, but it was for multiple models and I don't know for sure if my model has those or if it is relevant.
The reason for ice buildup is an air leak. Recheck all around the gasket by taking a dollar bill and closing the door on it and pulling it out. If you don't have resistance, you found your leak. Heat that area with a blow dryer to relax the gasket and close the door to let the magnet and seal set. Also, rub some vasoline on the hinge side gasket to keep it from dragging.
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